Installation - Carrier 59MN7A Installation, Start-Up, Operating And Service And Maintenance Instructions

INSTALLATION

NOTICE
This furnace is certified to leak 2% or less of nominal air
conditioning CFM delivered when pressurized to 1- -in. water
column with all present air inlets, including bottom closure in
upflow and horizontal applications, air outlets, and plumbing
and electrical ports sealed.
Upflow Installation
NOTE: The furnace must be pitched as shown in Fig. 22 for
proper condensate drainage.
Supply Air Connections
For a furnace not equipped with a cooling coil, the outlet duct shall
be provided with a removable access panel. This opening shall be
accessible when the furnace is installed and shall be of such a size
that the heat exchanger can be viewed for possible openings using
light assistance or a probe can be inserted for sampling the air
stream. The cover attachment shall prevent leaks.
Connect supply- -air duct to flanges on furnace supply- -air outlet.
Bend flange upward to 90_ with wide duct pliers. See Fig. 19. The
supply- -air duct must be connected to ONLY the furnace
supply- -outlet- -air duct flanges or air conditioning coil casing
(when used). DO NOT cut main furnace casing side to attach
supply air duct, humidifier, or other accessories. All supply- -side
accessories MUST be connected to duct external to furnace main
casing.
Return Air Connections
WARNING
!
FIRE HAZARD
A failure to follow this warning could cause personal injury,
death and/or property damage.
Never connect return- -air ducts to the back of the furnace.
Follow instructions below.
The return- -air duct must be connected to bottom, sides (left or
right), or a combination of bottom and side(s) of main furnace
casing. Bypass humidifier may be attached into unused return air
side of the furnace casing. See Fig. 23, 24, 25.
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed in
bottom return- -air opening. Remove this panel when bottom return
air is used. This panel may be used as the bottom closure of an
accessory bottom return air box, or discarded. To remove bottom
closure panel, perform the following:
1. Tilt or raise furnace and remove 4 screws holding bottom
plate. See Fig. 21.
2. Remove bottom plate.
3. Remove bottom closure panel.
4. Reinstall bottom plate and screws.
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed in
bottom return- -air opening. This panel MUST be in place when
only side return air is used.
NOTE: Side return- -air openings can be used in UPFLOW and
some HORIZONTAL configurations. Do not use side return- -air
openings in DOWNFLOW configuration.
25.
Leveling Legs (If Desired)
In upflow position with side return inlet(s), leveling legs may be
used. See Fig. 20. Install field- -supplied, 5/16 x 1- -1/2 in. (8 x 38
mm) (max) corrosion- -resistant machine bolts, washers and nuts.
NOTE: Bottom closure must be used when leveling legs are used.
It may be necessary to remove and reinstall bottom closure panel to
install leveling legs. To remove bottom closure panel, see Item 1 in
Bottom Return Air Inlet section in Step 1 above.
To install leveling legs:
Downflow Installation
NOTE: The furnace must be pitched as shown in Fig. 22 for
proper condensate drainage.
Supply Air Connections
NOTE: For downflow applications, this furnace is approved for
use on combustible flooring when any one of the following 3
accessories are used:
S Special Base, KGASB
S Cased Coil Assembly Part No. CNPV, CNRV, CAP, or CAR
S Coil Box Part No. KCAKC
NOTE: It is recommended that the perforated supply- -air duct
flanges be completely removed from furnace when installing the
furnace on a factory- -supplied cased coil or coil box. To remove the
supply- -air duct flange, use wide duct pliers or hand seamers to
bend flange back and forth until it breaks off. Be careful of sharp
edges. See Fig. 19.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts, and servicing furnaces.
Connect supply- -air duct to supply- -air outlet on furnace. Bend
flange inward past 90_ with wide duct pliers. See Fig. 19. The
supply- -air duct must be connected to ONLY the furnace supply
outlet or air conditioning coil casing (when used). When installed
on combustible material, supply- -air duct must be connected to
ONLY
factory- -approved air conditioning coil casing. DO NOT cut main
furnace casing to attach supply side air duct, humidifier, or other
accessories. All supply- -side accessories MUST be connected to
See Fig. 23, 24, and
duct external to furnace casing.
18
1. Position furnace on its back. Locate and drill a hole in each
bottom corner of furnace.
2. For each leg, install nut on bolt and then install bolt with
nut in hole. (Install flat washer if desired.)
3. Install another nut on other side of furnace base. (Install flat
washer if desired.)
4. Adjust outside nut to provide desired height, and tighten in-
side nut to secure arrangement.
5. Reinstall bottom closure panel if removed.
1. Determine application being installed from Table 8.
2. Construct hole in floor per Table 8 and Fig. 18.
3. Construct plenum to dimensions specified in Table 8 and
Fig. 18.
4. Install special base coil assembly or coil box as shown in in
Fig. 18.
CAUTION
!
the factory- -approved accessory subbase, or a